Roi Reichart

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SimLex-999: Evaluating Semantic Models With (Genuine) Similarity Estimation
We present SimLex-999, a gold standard resource for evaluating distributional semantic models that improves on existing resources in several important ways. First, in contrast to gold standards such as WordSim-353 and MEN, it explicitly quantifies similarity rather than association or relatedness so that pairs of entities that are associated but not… (More)
The NVI Clustering Evaluation Measure
Clustering is crucial for many NLP tasks and applications. However, evaluating the results of a clustering algorithm is hard. In this paper we focus on the evaluation setting in which a gold standard solution is available. We discuss two existing information theory based measures , V and VI, and show that they are both hard to use when comparing the… (More)
Neutralizing Linguistically Problematic Annotations in Unsupervised Dependency Parsing Evaluation
Dependency parsing is a central NLP task. In this paper we show that the common evaluation for unsupervised dependency parsing is highly sensitive to problematic annotations. We show that for three leading unsupervised set of parameters can be found whose modification yields a significant improvement in standard evaluation measures. These parameters… (More)
Modeling the Detection of Textual Cyberbullying
The scourge of cyberbullying has assumed alarming proportions with an ever-increasing number of adolescents admitting to having dealt with it either as a victim or as a bystander. Anonymity and the lack of meaningful supervision in the electronic medium are two factors that have exacerbated this social menace. Comments or posts involving sensitive topics… (More)
Self-Training for Enhancement and Domain Adaptation of Statistical Parsers Trained on Small Datasets
Creating large amounts of annotated data to train statistical PCFG parsers is expensive, and the performance of such parsers declines when training and test data are taken from different domains. In this paper we use self-training in order to improve the quality of a parser and to adapt it to a different domain , using only small amounts of manually… (More)
Multi-Task Active Learning for Linguistic Annotations
We extend the classical single-task active learning (AL) approach. In the multi-task active learning (MTAL) paradigm, we select examples for several annotation tasks rather than for a single one as usually done in the context of AL. We introduce two MTAL meta-protocols, alternating selection and rank combination , and propose a method to implement them in… (More)
Symmetric Pattern Based Word Embeddings for Improved Word Similarity Prediction
We present a novel word level vector representation based on symmetric patterns (SPs). For this aim we automatically acquire SPs (e.g., " X and Y ") from a large corpus of plain text, and generate vectors where each coordinate represents the co-occurrence in SPs of the represented word with another word of the vocabulary. Our representation has three… (More)
Confidence Driven Unsupervised Semantic Parsing
Current approaches for semantic parsing take a supervised approach requiring a considerable amount of training data which is expensive and difficult to obtain. This supervision bottleneck is one of the major difficulties in scaling up semantic parsing. We argue that a semantic parser can be trained effectively without annotated data, and introduce an… (More)
An Unsupervised Model for Instance Level Subcategorization Acquisition
Most existing systems for subcategoriza-tion frame (SCF) acquisition rely on supervised parsing and infer SCF distributions at type, rather than instance level. These systems suffer from poor portability across domains and their benefit for NLP tasks that involve sentence-level processing is limited. We propose a new unsuper-vised, Markov Random Field-based… (More)